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首页> 外文期刊>Journal of bacteriology >(Methyl)ammonium Transport in the Nitrogen-Fixing Bacterium Azospirillum brasilense
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(Methyl)ammonium Transport in the Nitrogen-Fixing Bacterium Azospirillum brasilense

机译:固氮细菌巴西细螺旋藻中的(甲基)铵转运

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An ammonium transporter of Azospirillum brasilense was characterized. In contrast to most previously reported putative prokaryotic NH4 + transporter genes, A. brasilense amtB is not part of an operon withglnB or glnZ which, in A. brasilense, encode nitrogen regulatory proteins PIIand PZ, respectively. Sequence analysis predicts the presence of 12 transmembrane domains in the deduced AmtB protein and classifies AmtB as an integral membrane protein. Nitrogen regulates the transcription of the amtB gene in A. brasilense by the Ntr system. amtB is the first gene identified in A. brasilense whose expression is regulated by NtrC. The observation that ammonium uptake is still possible in mutants lacking the AmtB protein suggests the presence of a second NH4 + transport mechanism. Growth ofamtB mutants at low ammonium concentrations is reduced compared to that of the wild type. This suggests that AmtB has a role in scavenging ammonium at low concentrations.
机译:表征了巴西细螺旋藻的铵转运蛋白。与大多数先前报道的推定的原核NH 4 + 转运蛋白基因 A相反。 brasilense amtB 不是 glnB glnZ 的操纵子的一部分,在 A中。 brasilense ,分别编码氮调节蛋白P II 和P Z 。序列分析预测了推导的AmtB蛋白中存在12个跨膜结构域,并将AmtB分类为完整的膜蛋白。氮调节 A中 amtB 基因的转录。 brasilense 通过Ntr系统。 amtB A中鉴定的第一个基因。 brasilense ,其表达受NtrC调控。缺乏AmtB蛋白的突变体中仍有可能吸收铵盐,这表明存在第二种NH 4 + 转运机制。与野生型相比,在低铵浓度下 amtB 突变体的生长减少。这表明AmtB在清除低浓度的铵中具有作用。

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